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Which of the following statements are correct?

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1, 3 dimethyl benzene is more reactive than 1,2 or 1, 4 – dimethyl benzene towards chlorination in HOAC

With n – propayl chloride in presence of ${AlCl}_{3}$ benzene gives n- propyl benzene as major product at -60°

The rate of nitration of $C_{6} D_{6}$ is less than that of $C_{6} H_{6}$

Sulphonation of benzene exhibits primary (hydrogen) isotopic effect

answer is A.

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Detailed Solution

A) The two - groups in1, 3-dimethyl benzene activate the same carbon. In the other two the two - $C H_{3}$ groups activate different carbon atoms.

(B) At -6ºC, energy required for rearrangement of carbocations is not available to all. So major product is n- propyl benzene. A 35ºC- isopropyl benzene is major product.

D) Sulphonation of benzene exhibits pri isotopic effect

In this stage Question Image bond breaking requires more energy than Nitration does not exhibit isotopic effect

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